A furnace has fire-brick walls made up of the following two materials in series: Non-corrosive brick as inner layer Clay brick as outer layer (material 1) (material 2) Thickness 4.5 inches 8 inches Thermal conductivity k1 k2
A furnace has fire-brick walls made up of the following two materials in series: Non-corrosive brick as inner layer Clay brick as outer layer (material 1) (material 2) Thickness 4.5 inches 8 inches Thermal conductivity k1 k2
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:A furnace has fire-brick walls made up of the following two materials in series:
Non-corrosive brick as inner layer Clay brick as outer layer
(material 1)
(material 2)
Thickness
4.5 inches
8 inches
Thermal conductivity
k1
k2
The temperature inside the furnace (inside wall surface of the non-corrosive brick) is found to be 1105 °F while the outside temperature (outside
wall surface of clay brick) is 365 °F. This is not the desired temperature inside the furnace so engineers thought of lagging the furnace walls with
another material to reduce heat loss. The additional lagging material consists of magnesia layer which is 2 inches thick and has a thermal
conductivity of 0.04 Btu /h.ft.°F.
During a test run on the furnace with the magnesia lagging material now, new temperature readings were recorded :
Point of measurement
Temperature reading
Inside furnace (inside wall surface of non-corrosive
1355 °F
brick
Interface between non-corrosive brick and clay
1290 °F
brick
Interface between clay brick and magnesia
890 °F
Outside furnace (outside wall surface of magnesia)
190 °F
With these new temperature readings, the engineers concluded that the magnesia lagging material has led to reduction in heat loss. How much
was the % heat loss saved by the magnesia lagging ?
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